Generator FAQ
Everything you need to know about diesel generator sizing, rental costs, maintenance, and more — answered by Aiwa Powers, Karachi's trusted generator specialists since 2006.
Quick Generator Size Reference
| Use Case | Recommended Size | Typical Load |
|---|---|---|
| Small apartment / kiosk | 10 kVA | 1 AC, lighting, fans |
| Medium home / small office | 15–25 kVA | 2–3 ACs, computers, fridge |
| Large home / mid office | 25–50 kVA | 3–5 ACs, server, pump |
| Commercial plaza / factory floor | 50–150 kVA | Industrial loads, HVAC |
| Hospital / large industrial | 150–500 kVA | Full facility backup |
Not sure? Request a free load assessment from our engineers.
Sizing
What size generator do I need for my house?
For a typical Pakistani home with 2–3 ACs (1-ton each), lighting, fans, and a fridge, you need a 15–25 kVA diesel generator. A small apartment with 1 AC needs 10 kVA. A larger home with 3–4 ACs, water pump, and multiple rooms needs 25–35 kVA. Always add a 20% safety buffer above your calculated load.
What size generator do I need for a shop or small business?
A small shop or kiosk typically needs 10–15 kVA. A mid-size office with 20–30 people, computers, and 2–4 ACs needs 25–50 kVA. A warehouse or factory floor typically requires 50–150 kVA. Contact Aiwa Powers for a free load assessment.
What is the difference between kVA and kW?
kVA is apparent power — the total capacity a generator can supply. kW is real usable power. For diesel generators, kW = kVA × 0.8. So a 25 kVA generator delivers approximately 20 kW of usable power. Always size by kVA when renting or buying.
Can a diesel generator run an air conditioner (AC)?
Yes. A 1-ton split AC draws about 1.2–1.5 kW running but has a 3–4 kW starting surge. A 10 kVA generator can handle 1–2 ACs alongside basic loads. For 3+ ACs, use a 25 kVA or larger unit.
Rental & Cost
How much does generator rental cost in Karachi?
Rental prices vary by kVA size and duration. Small generators (10 kVA) typically start from PKR 20,000–35,000/month. Larger units (100 kVA) range from PKR 80,000–150,000/month. All Aiwa Powers rentals include delivery, installation, and preventive maintenance. Contact us for an exact quote.
What is the minimum rental period?
Aiwa Powers offers daily, weekly, and monthly rentals. There is no fixed minimum — we accommodate short events, construction projects, and long-term commercial needs. Monthly rentals offer the best rate and include full maintenance.
Does Aiwa Powers sell generators or only rent?
Both. We maintain a rental fleet and also facilitate purchases of new and quality-inspected refurbished generators. We handle sourcing, import coordination, and delivery for purchases.
What areas does Aiwa Powers deliver to?
All areas of Karachi — SITE, Korangi, DHA, Clifton, Gulshan, North Karachi. We also deliver to Hyderabad, Sukkur, and other major cities across Sindh and Pakistan for larger orders.
Maintenance & Lifespan
How long does a diesel generator last?
A well-maintained diesel generator lasts 20,000–30,000 operating hours before a major overhaul — roughly 15–25 years at 4–6 hours daily. Japanese-engine models (Hino, Yanmar) regularly reach 30,000+ hours with proper servicing.
How often should a generator be serviced?
Oil and filter change every 250 hours or 6 months. Air filter check monthly. Full load test monthly. Annual comprehensive inspection by a certified engineer. Aiwa Powers rental units include scheduled preventive maintenance — you do not manage this.
What generator brands does Aiwa Powers stock?
Japanese-engine generators including Hino, plus Danyo and Perkins-based units. Our fleet covers 10 kVA to 500 kVA — all tested and serviced before deployment.
What is the best generator for home use in Pakistan?
A 15–25 kVA silent (canopy) diesel generator. Silent generators keep noise to 65–70 dB, suitable for residential areas. Japanese-engine models offer the best long-term reliability. Aiwa Powers stocks these for both rental and sale.
Still Have Questions?
Our team has been sizing and deploying generators in Karachi since 2006. Call us or send a message — we respond fast.
Need Emergency Power Backup?
Power failures don't wait for business hours. Call or WhatsApp Aiwa Powers now — we deploy diesel generators across Karachi within hours of your call.